Ejemplo n.º 1
0
func innerMu_h(env *tempAll.Environment, k vec.Vector) float64 {
	sxy := math.Sin(k[0]) - math.Sin(k[1])
	E := env.BogoEnergy(k)
	xi := env.Xi_h(k)
	delta := env.Delta_h(k)
	return sxy * sxy * math.Tanh(env.Beta*E/2.0) * (2.0*xi*xi + delta*delta) / (E * E * E)
}
Ejemplo n.º 2
0
// Evaluate the anomalous retarded pair Green's function,
// Pi^A(k, omega)_{xx, xy, yy}. k must be a two-dimensional vector.
func PiAnom(env *tempAll.Environment, k vec.Vector, omega float64) vec.Vector {
	piInner := func(q vec.Vector, out *vec.Vector) {
		// Do vector operations on out to avoid allocation:
		//  first case, out = k/2 + q
		(*out)[0] = k[0]/2.0 + q[0]
		(*out)[1] = k[1]/2.0 + q[1]
		Delta1 := env.Delta_h(*out)
		E1 := env.BogoEnergy(*out)
		//  second case, out = k/2 - q
		(*out)[0] = k[0]/2.0 - q[0]
		(*out)[1] = k[1]/2.0 - q[1]
		Delta2 := env.Delta_h(*out)
		E2 := env.BogoEnergy(*out)
		// Get part of result that's the same for all (xx, xy, yy):
		t1 := math.Tanh(env.Beta * E1 / 2.0)
		t2 := math.Tanh(env.Beta * E2 / 2.0)
		common := -Delta1 * Delta2 / (4.0 * E1 * E2) * ((t1+t2)*(1.0/(omega+E1+E2)-1.0/(omega-E1-E2)) + (t1-t2)*(1.0/(omega-E1+E2)-1.0/(omega+E1-E2)))
		// Set out = result:
		sx := math.Sin(q[0])
		sy := math.Sin(q[1])
		(*out)[0] = sx * sx * common
		(*out)[1] = sx * sy * common
		(*out)[2] = sy * sy * common
	}
	return bzone.VectorAvg(env.PointsPerSide, 2, 3, piInner)
}